1 Chronicles 23:4-14

4 David said, “Of these, twenty-four thousand are to be in charge of the work of the temple of the LORD and six thousand are to be officials and judges.
5 Four thousand are to be gatekeepers and four thousand are to praise the LORD with the musical instruments I have provided for that purpose.”
6 David separated the Levites into divisions corresponding to the sons of Levi: Gershon, Kohath and Merari.

Gershonites

7 Belonging to the Gershonites: Ladan and Shimei.
8 The sons of Ladan: Jehiel the first, Zetham and Joel—three in all.
9 The sons of Shimei: Shelomoth, Haziel and Haran—three in all. These were the heads of the families of Ladan.
10 And the sons of Shimei: Jahath, Ziza,a Jeush and Beriah. These were the sons of Shimei—four in all.
11 Jahath was the first and Ziza the second, but Jeush and Beriah did not have many sons; so they were counted as one family with one assignment.

Kohathites

12 The sons of Kohath: Amram, Izhar, Hebron and Uzziel—four in all.
13 The sons of Amram: Aaron and Moses. Aaron was set apart, he and his descendants forever, to consecrate the most holy things, to offer sacrifices before the LORD, to minister before him and to pronounce blessings in his name forever.
14 The sons of Moses the man of God were counted as part of the tribe of Levi.